HomeBelts and Cooling > Thermostat and HousingFour Seasons 86320 Engine Coolant Thermostat / Water Outlet Assembly
Part #: 86320

Four Seasons 86320 Engine Coolant Thermostat / Water Outlet Assembly

Water Outlet
⚙️ 31 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
📦Water Outlet
🚗Fitment: Lexus, GS350, IS300, IS350, RC300, and RC350
🔄Easy Returns — Return within 60 days for a full refund
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Reliable Engine Coolant Thermostat and Water Outlet Assembly

The Four Seasons Water Outlet assembly with part number 86320 is designed to maintain optimal engine temperature for select Lexus models. This engine coolant thermostat and water outlet assembly combines a durable plastic construction with an integrated thermostat to ensure efficient coolant flow and temperature regulation.

  • Includes thermostat for precise temperature control
  • Constructed from durable plastic material
  • Inlet diameter of 1.49 inches for proper coolant flow
  • Mount flange width of 0.39 inches for secure installation
  • Overall height of 4.00 inches
  • Compatible with Lexus GS350, IS300, IS350, RC300, and RC350 models
  • Gasket or seal included for leak prevention

About the Four Seasons Water Outlet Product Line

The Four Seasons Water Outlet product line focuses on engine coolant components that integrate thermostat functionality with water outlet assemblies. This combination helps streamline the cooling system by providing a single, reliable unit that manages coolant flow and temperature. The Water Outlet line is engineered to meet OEM specifications, ensuring compatibility and performance for vehicles like the Lexus GS350 and IS series.

Detailed Product Description

This Four Seasons 86320 engine coolant thermostat and water outlet assembly is made from high-quality plastic designed to withstand engine heat and pressure. The included thermostat regulates coolant temperature by opening and closing at precise intervals, helping prevent engine overheating or overcooling. The 1.49-inch inlet diameter supports proper coolant circulation, while the 0.39-inch mount flange width ensures a secure fit. With an overall height of 4.00 inches, this assembly fits seamlessly into the cooling system of compatible Lexus models.

Common Applications and Issues Addressed

  • Replacement for faulty or leaking water outlet assemblies
  • Solves engine overheating caused by thermostat failure
  • Prevents coolant leaks with included gasket or seal
  • Restores proper coolant flow in Lexus GS350, IS300, IS350, RC300, and RC350
  • Addresses temperature regulation problems in the cooling system

Installation Notes and Tips

When installing the Four Seasons 86320 water outlet assembly, ensure the gasket or seal is properly seated to prevent leaks. Verify the thermostat orientation matches OEM specifications for accurate temperature control. It is recommended to inspect the cooling system hoses and connections during installation to maintain overall system integrity.

Quality Assurance and Warranty

Four Seasons parts are manufactured to meet or exceed OEM standards for fit and function. The 86320 water outlet assembly includes a thermostat and gasket to provide a complete solution for engine coolant management. Please refer to Four Seasons' warranty policy for specific coverage details.

BrandFour Seasons
Part Number86320
PositionWater Outlet
DescriptionEngine coolant components
Gasket or Seal IncludedYes
Inlet Dia. IN1.49
MaterialPlastic
Mnt Flange Width IN0.39
Overall Height IN4.00
StyleW/ thermostat
Thermostat Included?Included
TypeOutlet

This part fits 31 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2025LexusIS3003.5LV6N/AWater Outlet
2025LexusIS350N/AWater Outlet
2025LexusRC3003.5LV6N/AWater Outlet
2025LexusRC350N/AWater Outlet
2024LexusIS3003.5LV6N/AWater Outlet
2024LexusIS350N/AWater Outlet
2024LexusRC3003.5LV6N/AWater Outlet
2024LexusRC350N/AWater Outlet
2023LexusIS3003.5LV6N/AWater Outlet
2023LexusIS350N/AWater Outlet
2023LexusRC3003.5LV6N/AWater Outlet
2023LexusRC350N/AWater Outlet
2022LexusIS3003.5LV6N/AWater Outlet
2022LexusIS350N/AWater Outlet
2022LexusRC3003.5LV6N/AWater Outlet
2022LexusRC350N/AWater Outlet
2021LexusIS3003.5LV6N/AWater Outlet
2021LexusIS350N/AWater Outlet
2021LexusRC3003.5LV6N/AWater Outlet
2021LexusRC350N/AWater Outlet
2020LexusGS350N/AWater Outlet
2020LexusIS3003.5LV6N/AWater Outlet
2020LexusIS350N/AWater Outlet
2020LexusRC3003.5LV6N/AWater Outlet
2020LexusRC350N/AWater Outlet
2019LexusGS350N/AWater Outlet
2019LexusIS3003.5LV6N/AWater Outlet
2019LexusIS350N/AWater Outlet
2019LexusRC3003.5LV6N/AWater Outlet
2019LexusRC350N/AWater Outlet
2018LexusGS350N/AWater Outlet

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

104618816031310701603131071863209025214W98850

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.